public boolean equals(int x, int y){
	if(x == this.x && y == this.y){
		return true;
	}
	else{
		return false;
	}
}

public int hashCode() {
	int hash = 1;
    
	hash = hash * 17 + this.x;
	hash = hash * 31 + this.y;

	return hash;
}